Add MulitpartEnityBuilder to HttpURLConnection

Question

I want to send some text and an image to server. I am using MultipartEntityBuilder for this purpose. But as of API 22 HttpEntity is depreciated. So, how should I add my multipart to the HttpURLConnection?

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);

MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
multipartEntityBuilder.setCharset(MIME.UTF8_CHARSET);

multipartEntityBuilder.addTextBody("fname", fname, ContentType.create("text/plain", MIME.UTF8_CHARSET));
                    .
                    .
                    .
multipartEntityBuilder.addTextBody("admin_id", adminDataListener.getAdminId(),
                            ContentType.create("text/plain", MIME.UTF8_CHARSET));

if (imageAttached){
multipartEntityBuilder.addTextBody("existing_image", adminDataListener.getAdminId(),
ContentType.create("text/plain", MIME.UTF8_CHARSET));
                        multipartEntityBuilder.addBinaryBody("image1 ", newImageFile, ContentType.MULTIPART_FORM_DATA,
                                newImageFile.getName());
} else {
        multipartEntityBuilder.addTextBody("existing_image", adminDataListener.getAdminImage(),
        ContentType.create("text/plain", MIME.UTF8_CHARSET));
        }

Answer 1

You have to define a boundary and use it building the multipart payload.

String boundary = "-----stackoverflow--------" + System.currentTimeMillis();

multipartEntityBuilder.setBoundary(boundary);

Then you should tell the used boundary to the server with:

conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

Finally build a HttpEntry and let it write its content to the outputstream

HttpEntity entity = multipartEntityBuilder.build();
entity.writeTo(conn.getOutputStream());

Getting responsecode and returned page in the usual way.